Appearance
Body is oval and laterally flattened. Mouth is rather small, more or less protrusive, with rather strong canine-like teeth. There are a few cephalic pores on the snout; lips are with 6–9 folds.
Head is generally longer than body depth. Dorsal fin is very long and reaches almost to the tail. Both sexes have a small dark spot at base of caudal fin and a dark blotch just above pectoral fin. Also, many darker spots on the body form 3 or 4 longitudinal stripes.
Generally, color reflects sexual dimorphism. Females and juveniles are grey-greenish or brownish, fading to a silvery color on the belly. Between immature males and mature females there are almost no differences in color. Males are more brightly colored, especially in the breeding season. Pale green, green-bluish or green-yellowish, longitudinal rows of red spots, with upper part of head dark blue.

